git.oblomov.eu Git - linux-2.6/blob - sound/pci/emu10k1/memory.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   3  *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
   4  *
   5  *  EMU10K1 memory page allocation (PTB area)
   6  *
   7  *
   8  *   This program is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License as published by
  10  *   the Free Software Foundation; either version 2 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This program is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with this program; if not, write to the Free Software
  20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  *
  22  */
  23
  24 #include <sound/driver.h>
  25 #include <linux/pci.h>
  26 #include <linux/time.h>
  27 #include <sound/core.h>
  28 #include <sound/emu10k1.h>
  29
  30 /* page arguments of these two macros are Emu page (4096 bytes), not like
  31  * aligned pages in others
  32  */
  33 #define __set_ptb_entry(emu,page,addr) \
  34         (((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << 1) | (page)))
  35
  36 #define UNIT_PAGES              (PAGE_SIZE / EMUPAGESIZE)
  37 #define MAX_ALIGN_PAGES         (MAXPAGES / UNIT_PAGES)
  38 /* get aligned page from offset address */
  39 #define get_aligned_page(offset)        ((offset) >> PAGE_SHIFT)
  40 /* get offset address from aligned page */
  41 #define aligned_page_offset(page)       ((page) << PAGE_SHIFT)
  42
  43 #if PAGE_SIZE == 4096
  44 /* page size == EMUPAGESIZE */
  45 /* fill PTB entrie(s) corresponding to page with addr */
  46 #define set_ptb_entry(emu,page,addr)    __set_ptb_entry(emu,page,addr)
  47 /* fill PTB entrie(s) corresponding to page with silence pointer */
  48 #define set_silent_ptb(emu,page)        __set_ptb_entry(emu,page,emu->silent_page.addr)
  49 #else
  50 /* fill PTB entries -- we need to fill UNIT_PAGES entries */
  51 static inline void set_ptb_entry(emu10k1_t *emu, int page, dma_addr_t addr)
  52 {
  53         int i;
  54         page *= UNIT_PAGES;
  55         for (i = 0; i < UNIT_PAGES; i++, page++) {
  56                 __set_ptb_entry(emu, page, addr);
  57                 addr += EMUPAGESIZE;
  58         }
  59 }
  60 static inline void set_silent_ptb(emu10k1_t *emu, int page)
  61 {
  62         int i;
  63         page *= UNIT_PAGES;
  64         for (i = 0; i < UNIT_PAGES; i++, page++)
  65                 /* do not increment ptr */
  66                 __set_ptb_entry(emu, page, emu->silent_page.addr);
  67 }
  68 #endif /* PAGE_SIZE */
  69
  70
  71 /*
  72  */
  73 static int synth_alloc_pages(emu10k1_t *hw, emu10k1_memblk_t *blk);
  74 static int synth_free_pages(emu10k1_t *hw, emu10k1_memblk_t *blk);
  75
  76 #define get_emu10k1_memblk(l,member)    list_entry(l, emu10k1_memblk_t, member)
  77
  78
  79 /* initialize emu10k1 part */
  80 static void emu10k1_memblk_init(emu10k1_memblk_t *blk)
  81 {
  82         blk->mapped_page = -1;
  83         INIT_LIST_HEAD(&blk->mapped_link);
  84         INIT_LIST_HEAD(&blk->mapped_order_link);
  85         blk->map_locked = 0;
  86
  87         blk->first_page = get_aligned_page(blk->mem.offset);
  88         blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1);
  89         blk->pages = blk->last_page - blk->first_page + 1;
  90 }
  91
  92 /*
  93  * search empty region on PTB with the given size
  94  *
  95  * if an empty region is found, return the page and store the next mapped block
  96  * in nextp
  97  * if not found, return a negative error code.
  98  */
  99 static int search_empty_map_area(emu10k1_t *emu, int npages, struct list_head **nextp)
 100 {
 101         int page = 0, found_page = -ENOMEM;
 102         int max_size = npages;
 103         int size;
 104         struct list_head *candidate = &emu->mapped_link_head;
 105         struct list_head *pos;
 106
 107         list_for_each (pos, &emu->mapped_link_head) {
 108                 emu10k1_memblk_t *blk = get_emu10k1_memblk(pos, mapped_link);
 109                 snd_assert(blk->mapped_page >= 0, continue);
 110                 size = blk->mapped_page - page;
 111                 if (size == npages) {
 112                         *nextp = pos;
 113                         return page;
 114                 }
 115                 else if (size > max_size) {
 116                         /* we look for the maximum empty hole */
 117                         max_size = size;
 118                         candidate = pos;
 119                         found_page = page;
 120                 }
 121                 page = blk->mapped_page + blk->pages;
 122         }
 123         size = MAX_ALIGN_PAGES - page;
 124         if (size >= max_size) {
 125                 *nextp = pos;
 126                 return page;
 127         }
 128         *nextp = candidate;
 129         return found_page;
 130 }
 131
 132 /*
 133  * map a memory block onto emu10k1's PTB
 134  *
 135  * call with memblk_lock held
 136  */
 137 static int map_memblk(emu10k1_t *emu, emu10k1_memblk_t *blk)
 138 {
 139         int page, pg;
 140         struct list_head *next;
 141
 142         page = search_empty_map_area(emu, blk->pages, &next);
 143         if (page < 0) /* not found */
 144                 return page;
 145         /* insert this block in the proper position of mapped list */
 146         list_add_tail(&blk->mapped_link, next);
 147         /* append this as a newest block in order list */
 148         list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
 149         blk->mapped_page = page;
 150         /* fill PTB */
 151         for (pg = blk->first_page; pg <= blk->last_page; pg++) {
 152                 set_ptb_entry(emu, page, emu->page_addr_table[pg]);
 153                 page++;
 154         }
 155         return 0;
 156 }
 157
 158 /*
 159  * unmap the block
 160  * return the size of resultant empty pages
 161  *
 162  * call with memblk_lock held
 163  */
 164 static int unmap_memblk(emu10k1_t *emu, emu10k1_memblk_t *blk)
 165 {
 166         int start_page, end_page, mpage, pg;
 167         struct list_head *p;
 168         emu10k1_memblk_t *q;
 169
 170         /* calculate the expected size of empty region */
 171         if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) {
 172                 q = get_emu10k1_memblk(p, mapped_link);
 173                 start_page = q->mapped_page + q->pages;
 174         } else
 175                 start_page = 0;
 176         if ((p = blk->mapped_link.next) != &emu->mapped_link_head) {
 177                 q = get_emu10k1_memblk(p, mapped_link);
 178                 end_page = q->mapped_page;
 179         } else
 180                 end_page = MAX_ALIGN_PAGES;
 181
 182         /* remove links */
 183         list_del(&blk->mapped_link);
 184         list_del(&blk->mapped_order_link);
 185         /* clear PTB */
 186         mpage = blk->mapped_page;
 187         for (pg = blk->first_page; pg <= blk->last_page; pg++) {
 188                 set_silent_ptb(emu, mpage);
 189                 mpage++;
 190         }
 191         blk->mapped_page = -1;
 192         return end_page - start_page; /* return the new empty size */
 193 }
 194
 195 /*
 196  * search empty pages with the given size, and create a memory block
 197  *
 198  * unlike synth_alloc the memory block is aligned to the page start
 199  */
 200 static emu10k1_memblk_t *
 201 search_empty(emu10k1_t *emu, int size)
 202 {
 203         struct list_head *p;
 204         emu10k1_memblk_t *blk;
 205         int page, psize;
 206
 207         psize = get_aligned_page(size + PAGE_SIZE -1);
 208         page = 0;
 209         list_for_each(p, &emu->memhdr->block) {
 210                 blk = get_emu10k1_memblk(p, mem.list);
 211                 if (page + psize <= blk->first_page)
 212                         goto __found_pages;
 213                 page = blk->last_page + 1;
 214         }
 215         if (page + psize > emu->max_cache_pages)
 216                 return NULL;
 217
 218 __found_pages:
 219         /* create a new memory block */
 220         blk = (emu10k1_memblk_t *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev);
 221         if (blk == NULL)
 222                 return NULL;
 223         blk->mem.offset = aligned_page_offset(page); /* set aligned offset */
 224         emu10k1_memblk_init(blk);
 225         return blk;
 226 }
 227
 228
 229 /*
 230  * check if the given pointer is valid for pages
 231  */
 232 static int is_valid_page(emu10k1_t *emu, dma_addr_t addr)
 233 {
 234         if (addr & ~emu->dma_mask) {
 235                 snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr);
 236                 return 0;
 237         }
 238         if (addr & (EMUPAGESIZE-1)) {
 239                 snd_printk(KERN_ERR "page is not aligned\n");
 240                 return 0;
 241         }
 242         return 1;
 243 }
 244
 245 /*
 246  * map the given memory block on PTB.
 247  * if the block is already mapped, update the link order.
 248  * if no empty pages are found, tries to release unsed memory blocks
 249  * and retry the mapping.
 250  */
 251 int snd_emu10k1_memblk_map(emu10k1_t *emu, emu10k1_memblk_t *blk)
 252 {
 253         int err;
 254         int size;
 255         struct list_head *p, *nextp;
 256         emu10k1_memblk_t *deleted;
 257         unsigned long flags;
 258
 259         spin_lock_irqsave(&emu->memblk_lock, flags);
 260         if (blk->mapped_page >= 0) {
 261                 /* update order link */
 262                 list_del(&blk->mapped_order_link);
 263                 list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
 264                 spin_unlock_irqrestore(&emu->memblk_lock, flags);
 265                 return 0;
 266         }
 267         if ((err = map_memblk(emu, blk)) < 0) {
 268                 /* no enough page - try to unmap some blocks */
 269                 /* starting from the oldest block */
 270                 p = emu->mapped_order_link_head.next;
 271                 for (; p != &emu->mapped_order_link_head; p = nextp) {
 272                         nextp = p->next;
 273                         deleted = get_emu10k1_memblk(p, mapped_order_link);
 274                         if (deleted->map_locked)
 275                                 continue;
 276                         size = unmap_memblk(emu, deleted);
 277                         if (size >= blk->pages) {
 278                                 /* ok the empty region is enough large */
 279                                 err = map_memblk(emu, blk);
 280                                 break;
 281                         }
 282                 }
 283         }
 284         spin_unlock_irqrestore(&emu->memblk_lock, flags);
 285         return err;
 286 }
 287
 288 /*
 289  * page allocation for DMA
 290  */
 291 snd_util_memblk_t *
 292 snd_emu10k1_alloc_pages(emu10k1_t *emu, snd_pcm_substream_t *substream)
 293 {
 294         snd_pcm_runtime_t *runtime = substream->runtime;
 295         struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);
 296         snd_util_memhdr_t *hdr;
 297         emu10k1_memblk_t *blk;
 298         int page, err, idx;
 299
 300         snd_assert(emu, return NULL);
 301         snd_assert(runtime->dma_bytes > 0 && runtime->dma_bytes < MAXPAGES * EMUPAGESIZE, return NULL);
 302         hdr = emu->memhdr;
 303         snd_assert(hdr, return NULL);
 304
 305         down(&hdr->block_mutex);
 306         blk = search_empty(emu, runtime->dma_bytes);
 307         if (blk == NULL) {
 308                 up(&hdr->block_mutex);
 309                 return NULL;
 310         }
 311         /* fill buffer addresses but pointers are not stored so that
 312          * snd_free_pci_page() is not called in in synth_free()
 313          */
 314         idx = 0;
 315         for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
 316                 dma_addr_t addr;
 317 #ifdef CONFIG_SND_DEBUG
 318                 if (idx >= sgbuf->pages) {
 319                         printk(KERN_ERR "emu: pages overflow! (%d-%d) for %d\n",
 320                                blk->first_page, blk->last_page, sgbuf->pages);
 321                         up(&hdr->block_mutex);
 322                         return NULL;
 323                 }
 324 #endif
 325                 addr = sgbuf->table[idx].addr;
 326                 if (! is_valid_page(emu, addr)) {
 327                         printk(KERN_ERR "emu: failure page = %d\n", idx);
 328                         up(&hdr->block_mutex);
 329                         return NULL;
 330                 }
 331                 emu->page_addr_table[page] = addr;
 332                 emu->page_ptr_table[page] = NULL;
 333         }
 334
 335         /* set PTB entries */
 336         blk->map_locked = 1; /* do not unmap this block! */
 337         err = snd_emu10k1_memblk_map(emu, blk);
 338         if (err < 0) {
 339                 __snd_util_mem_free(hdr, (snd_util_memblk_t *)blk);
 340                 up(&hdr->block_mutex);
 341                 return NULL;
 342         }
 343         up(&hdr->block_mutex);
 344         return (snd_util_memblk_t *)blk;
 345 }
 346
 347
 348 /*
 349  * release DMA buffer from page table
 350  */
 351 int snd_emu10k1_free_pages(emu10k1_t *emu, snd_util_memblk_t *blk)
 352 {
 353         snd_assert(emu && blk, return -EINVAL);
 354         return snd_emu10k1_synth_free(emu, blk);
 355 }
 356
 357
 358 /*
 359  * memory allocation using multiple pages (for synth)
 360  * Unlike the DMA allocation above, non-contiguous pages are assined.
 361  */
 362
 363 /*
 364  * allocate a synth sample area
 365  */
 366 snd_util_memblk_t *
 367 snd_emu10k1_synth_alloc(emu10k1_t *hw, unsigned int size)
 368 {
 369         emu10k1_memblk_t *blk;
 370         snd_util_memhdr_t *hdr = hw->memhdr;
 371
 372         down(&hdr->block_mutex);
 373         blk = (emu10k1_memblk_t *)__snd_util_mem_alloc(hdr, size);
 374         if (blk == NULL) {
 375                 up(&hdr->block_mutex);
 376                 return NULL;
 377         }
 378         if (synth_alloc_pages(hw, blk)) {
 379                 __snd_util_mem_free(hdr, (snd_util_memblk_t *)blk);
 380                 up(&hdr->block_mutex);
 381                 return NULL;
 382         }
 383         snd_emu10k1_memblk_map(hw, blk);
 384         up(&hdr->block_mutex);
 385         return (snd_util_memblk_t *)blk;
 386 }
 387
 388
 389 /*
 390  * free a synth sample area
 391  */
 392 int
 393 snd_emu10k1_synth_free(emu10k1_t *emu, snd_util_memblk_t *memblk)
 394 {
 395         snd_util_memhdr_t *hdr = emu->memhdr;
 396         emu10k1_memblk_t *blk = (emu10k1_memblk_t *)memblk;
 397         unsigned long flags;
 398
 399         down(&hdr->block_mutex);
 400         spin_lock_irqsave(&emu->memblk_lock, flags);
 401         if (blk->mapped_page >= 0)
 402                 unmap_memblk(emu, blk);
 403         spin_unlock_irqrestore(&emu->memblk_lock, flags);
 404         synth_free_pages(emu, blk);
 405          __snd_util_mem_free(hdr, memblk);
 406         up(&hdr->block_mutex);
 407         return 0;
 408 }
 409
 410
 411 /* check new allocation range */
 412 static void get_single_page_range(snd_util_memhdr_t *hdr, emu10k1_memblk_t *blk, int *first_page_ret, int *last_page_ret)
 413 {
 414         struct list_head *p;
 415         emu10k1_memblk_t *q;
 416         int first_page, last_page;
 417         first_page = blk->first_page;
 418         if ((p = blk->mem.list.prev) != &hdr->block) {
 419                 q = get_emu10k1_memblk(p, mem.list);
 420                 if (q->last_page == first_page)
 421                         first_page++;  /* first page was already allocated */
 422         }
 423         last_page = blk->last_page;
 424         if ((p = blk->mem.list.next) != &hdr->block) {
 425                 q = get_emu10k1_memblk(p, mem.list);
 426                 if (q->first_page == last_page)
 427                         last_page--; /* last page was already allocated */
 428         }
 429         *first_page_ret = first_page;
 430         *last_page_ret = last_page;
 431 }
 432
 433 /*
 434  * allocate kernel pages
 435  */
 436 static int synth_alloc_pages(emu10k1_t *emu, emu10k1_memblk_t *blk)
 437 {
 438         int page, first_page, last_page;
 439         struct snd_dma_buffer dmab;
 440
 441         emu10k1_memblk_init(blk);
 442         get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
 443         /* allocate kernel pages */
 444         for (page = first_page; page <= last_page; page++) {
 445                 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(emu->pci),
 446                                         PAGE_SIZE, &dmab) < 0)
 447                         goto __fail;
 448                 if (! is_valid_page(emu, dmab.addr)) {
 449                         snd_dma_free_pages(&dmab);
 450                         goto __fail;
 451                 }
 452                 emu->page_addr_table[page] = dmab.addr;
 453                 emu->page_ptr_table[page] = dmab.area;
 454         }
 455         return 0;
 456
 457 __fail:
 458         /* release allocated pages */
 459         last_page = page - 1;
 460         for (page = first_page; page <= last_page; page++) {
 461                 dmab.area = emu->page_ptr_table[page];
 462                 dmab.addr = emu->page_addr_table[page];
 463                 dmab.bytes = PAGE_SIZE;
 464                 snd_dma_free_pages(&dmab);
 465                 emu->page_addr_table[page] = 0;
 466                 emu->page_ptr_table[page] = NULL;
 467         }
 468
 469         return -ENOMEM;
 470 }
 471
 472 /*
 473  * free pages
 474  */
 475 static int synth_free_pages(emu10k1_t *emu, emu10k1_memblk_t *blk)
 476 {
 477         int page, first_page, last_page;
 478         struct snd_dma_buffer dmab;
 479
 480         get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
 481         dmab.dev.type = SNDRV_DMA_TYPE_DEV;
 482         dmab.dev.dev = snd_dma_pci_data(emu->pci);
 483         for (page = first_page; page <= last_page; page++) {
 484                 if (emu->page_ptr_table[page] == NULL)
 485                         continue;
 486                 dmab.area = emu->page_ptr_table[page];
 487                 dmab.addr = emu->page_addr_table[page];
 488                 dmab.bytes = PAGE_SIZE;
 489                 snd_dma_free_pages(&dmab);
 490                 emu->page_addr_table[page] = 0;
 491                 emu->page_ptr_table[page] = NULL;
 492         }
 493
 494         return 0;
 495 }
 496
 497 /* calculate buffer pointer from offset address */
 498 static inline void *offset_ptr(emu10k1_t *emu, int page, int offset)
 499 {
 500         char *ptr;
 501         snd_assert(page >= 0 && page < emu->max_cache_pages, return NULL);
 502         ptr = emu->page_ptr_table[page];
 503         if (! ptr) {
 504                 printk(KERN_ERR "emu10k1: access to NULL ptr: page = %d\n", page);
 505                 return NULL;
 506         }
 507         ptr += offset & (PAGE_SIZE - 1);
 508         return (void*)ptr;
 509 }
 510
 511 /*
 512  * bzero(blk + offset, size)
 513  */
 514 int snd_emu10k1_synth_bzero(emu10k1_t *emu, snd_util_memblk_t *blk, int offset, int size)
 515 {
 516         int page, nextofs, end_offset, temp, temp1;
 517         void *ptr;
 518         emu10k1_memblk_t *p = (emu10k1_memblk_t *)blk;
 519
 520         offset += blk->offset & (PAGE_SIZE - 1);
 521         end_offset = offset + size;
 522         page = get_aligned_page(offset);
 523         do {
 524                 nextofs = aligned_page_offset(page + 1);
 525                 temp = nextofs - offset;
 526                 temp1 = end_offset - offset;
 527                 if (temp1 < temp)
 528                         temp = temp1;
 529                 ptr = offset_ptr(emu, page + p->first_page, offset);
 530                 if (ptr)
 531                         memset(ptr, 0, temp);
 532                 offset = nextofs;
 533                 page++;
 534         } while (offset < end_offset);
 535         return 0;
 536 }
 537
 538 /*
 539  * copy_from_user(blk + offset, data, size)
 540  */
 541 int snd_emu10k1_synth_copy_from_user(emu10k1_t *emu, snd_util_memblk_t *blk, int offset, const char __user *data, int size)
 542 {
 543         int page, nextofs, end_offset, temp, temp1;
 544         void *ptr;
 545         emu10k1_memblk_t *p = (emu10k1_memblk_t *)blk;
 546
 547         offset += blk->offset & (PAGE_SIZE - 1);
 548         end_offset = offset + size;
 549         page = get_aligned_page(offset);
 550         do {
 551                 nextofs = aligned_page_offset(page + 1);
 552                 temp = nextofs - offset;
 553                 temp1 = end_offset - offset;
 554                 if (temp1 < temp)
 555                         temp = temp1;
 556                 ptr = offset_ptr(emu, page + p->first_page, offset);
 557                 if (ptr && copy_from_user(ptr, data, temp))
 558                         return -EFAULT;
 559                 offset = nextofs;
 560                 data += temp;
 561                 page++;
 562         } while (offset < end_offset);
 563         return 0;
 564 }